Is the prophecy destined to occur or is it a manifestation of the fact that macbeth knows of it?

Step 1: (ask questions)
- Why did Macbeth trust the Witches?
- Are prophecies destined?
- Can you change your own destiny?

Step 2: (determine a theme or idea)
- That Macbeth's lust for power eventually lead him to his collapse.
- Witches were right but ultimately, they were a bad influence.
- Shouldn't trust everything/
- You make your own destiny.

Step3: (state how the theme or idea is evident in the text)
- It is a mystery, if the prophecy would have occurred no matter what Macbeth does, knowing or not knowing, or it ended it up like so because Macbeth knew it and acted to change or not change it.